I've never seen this before. I have no idea what's happening here. Anyone interested in helping me investigate?

https://youtube.com/clip/UgkxZnekxLQx7vqlZJYX2Vhwoa_8IuFS1da2

it looks like he's just entering a level skip code to show off the game

Probably true! Just checked back and other levels do skip at random parts as well...Well, too bad that would've been something.

Edit: Resolved: He's just using a trainer that makes it available to skip stages using a hotkey.